title: COPD exacerbations: the importance of a standard definition.
mesh_terms: D000553:Ambulatory Care; D001424:Bacterial Infections / Q000150:complications; D015415:Biomarkers / Q000097:blood; D005541:Forced Expiratory Volume / Q000502:physiology; D006801:Humans; D029424:Pulmonary Disease, Chronic Obstructive / Q000175:diagnosis* / Q000503:physiopathology / Q000628:therapy; D014777:Virus Diseases / Q000150:complications; D014797:Vital Capacity / Q000502:physiology
chemical_list: D015415:Biomarkers